T-Mobile is replacing the antiquated trackballs on BlackBerry's Pearl 8100 and 8120, and the Curve 8320 smartphones for free from the 15th of February, to any customers who are having problems with them. It's one of the reasons RIM moved from trackballs to optical trackpads, so if you aren't having problems yet, mark my words: you will. [TMO News via Electronista]